Chuck for a tube or sleeve and serving as a bobbin support

ABSTRACT

A chuck or mandrel for a bobbin tube or sleeve serving as bobbin support embodying a thread catch ring and a thread severing ring defining therebetween a thread catching zone. The thread severing ring is provided at an end face with a substantially ring-shaped arrangement of spaced recesses and teeth formed between such recesses, these teeth each having an inner sharp cutting edge for engaging and separating or cutting a thread. The teeth are arranged in a direction facing away from the end face of the bobbin tube or sleeve. The thread catch ring is located at the region of the end face of the thread severing ring. This thread catch ring extends at least partially beneath the teeth of the thread severing ring when the tube is completely pushed onto the chuck. There are also provided thread clamping means.

United States Patent 7 [191 Wust CHUCK FOR A TUBE OR SLEEVE AND SERVINGAS A BOBBIN SUPPORT [75] Inventor: Olivier Wust, Seuzach, Switzerland[73] Assignee: Rieter Machine Works Ltd.,

Winterthur, Switzerland 22 Filed: Oct. 19, 1972 21 App]. No.2 299,024

[30] Foreign Application Priority Data Sept. 7, 1972 Switzerland13135/72 [52] US. Cl 2.42/19, 242/18 PW, 242/18 A, 242/125.1

[51] Int. Cl B65h75/28, B6511 75/32- [58] Field of Search 242/19, 18 A,18 PW, 25 A, 242/125, 125.1

[56] References Cited FOREIGN PATENTS OR APPLICATIONS 2,048,416 4/1971Germany 242/18 A 1,097,204 12/1967 Great Britain 242/18 A 1 Apr. 2, 1974Primary Examiner-Stanley N. Gilreath Attorney, Agent, or Firm-Werner W.Kleeman [57] ABSTRACT A chuck or mandrel for a bobbin tube or sleeveserving as bobbin support embodying a thread catch ring and a threadsevering ring defining therebetween a thread catching zone. The threadsevering ring is provided at'an end face with a substantiallyring-shaped arrangement of spaced recesses and teeth formed between suchrecesses, these teeth each having an inner sharp cutting edge forengaging and separating or cutting a thread. The teeth are arranged in adirection facing away from the end face of the bobbin tube or sleeve.The thread catch ring is located at the region of the end face of thethread severing ring. This thread catch ring extends at least partiallybeneath the teeth of the thread severing ring when the tube iscompletely pushed onto the chuck. There are also provided threadclamping means.

15 Claims, 6 Drawing Figures BACKGROUND OF THE INVENTION The presentinvention relates to a new and improved construction of chuck or mandrelfor a bobbin tube serving as a bobbin support and embodying a threadcatch zone provided with a thread severing or separation ring arrangedconcentrically with respect to the chuck, the thread severing ring isprovided at its end face with a ring-shaped arrangement of recesses andthus produced teeth each having an inner sharp cutting edge for engagingand cutting a thread. Such type chuck or mandrel is arranged, forinstance, at a winder for endless filaments or threads equipped with anautomatic bobbin change device.

There are already known to the art winder devices for endless threadshaving automatic bobbin change devices, wherein two bobbin tubes orsleeves alternately take-up the thread delivered at a high speed andafter reaching a desired package or bobbin size, with simultaneoustransfer of the thread to the empty bobbin tube or sleeve, are rockedout of a work position into an idle position. Thread transfer occurs inthat the thread, which is not being traversed at the moment of threadtransfer, is partially drawn over a thread severing or separtion ringowing to axial displacement of the bobbin chuck or mandrel and seized bysuitable means and thus cut or separated and wound-up with a number ofreserve windings applied to the bobbin tube or sleeve. The threadsevering ring equipped with teeth arranged at an end face and rigidlyconnected with the chuck together with a confronting end face of thebobbin tube maintaining an intermediate space or compartment forms thethread catch zone. During the bobbin change operation the thread arrivesat this intermediate space or compartment and is intended to be engagedby the teeth and separated or cut. Within the region of the teeth anoutwardly tapering conical portion which slightly extends past theregion of the teeth, i.e., tapers in the direction of free end of thetube, on the one hand, forms a stop for the bobbin tube and, on theother hand, the outwardly directed inclination of the conical portionallows, during doffing of the bobbin, easy removal of thread windingswhich possibly remain at such location.

The drawback of such devices is that the boundary surfaces of the threadinsertionintermediate compartment and which boundary surfaces extendparallel and perpendicular to the axis and are formed on the one hand bythe face of the teeth and on the other hand the end faces of the tube,as well as the outwardly tapering conical portion within the ring ofteeth do not allow the thread to be guided with sufficient security intothe cutting zone of the teeth. The cutting or separation of the threadis therefore not positively guaranteed, which during thread transfer canresult in undesired disturbances.

A further drawback of such devices resides in the necessity ofmaintaining a given minimum height of the thread severing ring owing tothe requirements of strength and the constructional design. Therefore,the tubes likewise must possess a minimum wall thickness which isgoverned by the foregoing, since the end faces of the tubes constitute aboundary surface of the thread catch zone.

SUMMARY OF THE INVENTION Hence, it is a primary object of the presentinvention to provide an improved chuck or mandrel construction for abobbin tube which is not associated with the aforementioned drawbacksand limitations of the prior art constructions discussed above.

A further object of the invention relates to an improved construction ofbobbin support chuck which positively ensures that the thread or thelike will be severed during a bobbin change operation.

Now in order to implement these and still further objects of theinvention, which will become more readily apparent as the descriptionproceeds, the inventive I construction of bobbin support chuck whichdoes not possess the aforementioned drawbacks, is manifested by thefeatures that a chuck for a tube serving as bobbin support and having athread catch zone is provided with a thread severing ring arrangedconcentrically with respect to the chuck. The thread severing ring isequipped at an end face with a substantially ringshaped arrangement ofrecesses and thereby formed teeth having inner sharp cutting edges forengaging and cutting a thread. The teeth are arranged in a directionwhich faces away from the end face of the tube. A thread catch ring islocated at the region of the end face of the thread severing ring, thisthread catch ring extending at least partially beneath the teeth bymeans of a conical thread guide surface when the tube is completelypushed onto the chuck. There are also provided thread clamping means.The thread severing ring is movably arranged upon the chuck in order tobe able to easily remove any thread windings located between the threadsevering ring and the thread catch ring.

' BRIEF DESCRIPTION OF THE DRAWINGS The invention will be betterunderstood and objects other than those set forth above, will becomeapparent when consideration is given to the following detaileddescription thereof. Such description makes reference to the annexeddrawings wherein:

FIG. 1 is a fragmentary longitudinal sectional view of a bobbin tubechuck with a bobbin tube mounted thereat;

FIG. 2 is an enlarged fragmentary perspective view of the threadsevering or separation ring;

FIGS. 3, 4 and 5 are respective enlarged sections of a thread catch ringand thread severing ring; and

FIG. 6 is a fragmentary longitudinal sectional view of a furtherembodiment of bobbin tube chuck with a bobbin tube mounted thereat.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Describing now thedrawings, and turning attention initially to the embodiment of FIG. 1,there is illustrated therein a chuck or mandrel 50 embodying a chuck ormandrel shaft 1 with a roller bearing 3 carrying a chuck sleeve 2. Atthe end of the chuck sleeve 2 facing the side of the machine, indicatedby the directional arrow A, there is arranged a thread catch ring 4which is fixedly connected with the chuck sleeve 2 by means of a bolt 5or equivalent structure. A thread severing or separation ring 6 isdisplaceably arranged at a cylindrical sliding surface 7 between thethread catch ring 4 and a stop 8. This severing ring 6 possesses acollar 9 which slightly conically tapers in the direction of the sleeveas well as a stop for receiving a bobbin tube 11. Furthermore, thethread severing ring 6"possesses a ring-shaped row of substantiallyroof-shaped inclined or bevelled teeth 12 arranged in a directionpointing away from the end face of the bobbin tube. These teeth 12 areformed at their sides by recesses 13 tapering in radialdirection and atthe outer surface by means of the surface 14 which tapers conically atan inclination slightly towards the tube 11- and internally by theconical surface 15 which tapers at an inclination away from the tube. Bymeans of the conical surface 15 and the recesses 13 there is formed acutting edge 16 which is positioned at an inclination with respect tothe axis of the chuck.

The thread catch ring 4 possesses a conical guide surface 17'confrontingthe thread severing or separation ring 6, this conical surface 17partially extending beneath the teeth 12 of such thread severing ring,as shown. Furthermore, the thread catch ring 4 possesses a cylindricalthread guide surface 18. As best seen by referring to FIG. 3 a threadclamping space or gap 19 is present between the thread catch ring 4 andthe thread severing ring 6,.the width of which is governed by thespacing of end wall 20'of the thread severing ring 6 and end wall 21 ofthe thread catch ring 4. A projec-' tion in the form at a cam or dog 22and belonging to the thread catch ring'4 determines such spacing.

FIG. 4 illustrates a variant .of the thread clamping space or gap 23.wherein theboundaries or boundary surfaces thereof are formed by aconical surface 24 belonging to the thread catch ring 4 and the end orboundary surface 20 belonging to the thread severing or separation ring6. y

In a further variant of the invention as depicted in FIG. 5 athreadclamping space or gap 25 is formed by the conical surface 24 of thethread catch ring 4 and an end or boundary surface 26 of an elastic ringmember 27 engaged by or seated at the thread severing or separation ring6. This elastic ring member 27 is formed, for instance, of rubber oranother suitable elastic material.

FIG. 6 illustrates a variant form of thread severing or separation ring28 which is connected by a cylindrical surface 29 with the bobbin tubesleeve 11 and can be withdrawn together therewith from chuck sleeve 30.

Now, if during a bobbin change operation the thread should betransferred from the full bobbin tube or sleeve to the empty bobbin tubeor sleeve, then by means of the cylindrical surface 18 and through axialdisplacement of either the thread 31 or the chuck or mandrel such threadslides over the conical guide surface 17 and therefore comes into theregion of the respective thread clamping space or gap 19, 23 or 25 andthe teeth 12. The thread clamping space or gap 19, 23 or 25respectively, is positioned in the direction of the chuck sleeve 2 withregard to the cutting edge '16 in such a manner that the thread (FIG. 2)extending essentially perpendicular to the chuck axis is engaged by therelevant thread clamping space or gap and by means of the cutting edge16 is flexed or bent at such cutting edge and guided along such cuttingedge in the direction D (FIG. 2) and thus cut. Owing to this movementalong the cutting edge 16* thick threads are also positively cut.Moreover, the thread 31 which is seized or engaged by the aforementionedclamping space or gap 19, 23 or 25 respectively, is practically simultaneously guided through the recess 13 at the surface 14,

from which location the thread easily arrives at the bobbin tube 11 inorder to deposit several reserve windings 32 owing to axial displacementof the chuck or the thread. Thereafter, there is formed at such reservewinding and after initiating the conventional traversing stroke apackage 33, as such has been described, for instance, in Swiss Pat. No.513,763. During doffing of the full bobbin in the direction of the arrowB (FIG. I) the thread severing ring 6 is displaced up to the region ofthe stop 8, or in the case of the embodiment of FIG. 6 withdrawn fromthe chuck together with the bobbin, so that the end of the thread 31fixedly retained in the clamping space or gap 19 or 23 or 25respectively is freed and easily removed.

The described apparatus possesses, in contrast to the known solutions ofthe prior art, the following noteworthy advantages:

l. The thread is guided cleanly and positively at the region of thecutting elements.

2. Owing to the use of the novel thread severing ring of this inventionthere is overcome the initially discussed drawback of the prior requiredminimum wall thickness of the tubes determined by the height of thethread severing ring. The tubes can possess random wall thickness, onlygoverned by the desired strength of the tubes.

3. Owing to the practically simultaneous cutting and guiding of thethread through the recess 13 at a cutting tooth 12 there are avoidedwindings between the thread catch ring and the thread separation ring,something which is a prerequisite for automatic unloading of the bobbinsand loading of the empty tubes.

4. Reliable cutting of the thread in that the thread which extendsessentially perpendicular to the bobbin axis is drawn over the cuttingedges which are at an inclination with respect to the'bobbin axis.

5. Positive retention of the separated thread at the chuck after cuttingfor the faultless entrainment of the infed thread and therefore positivestarting of the windmg.

6. The constructional embodiments are simple and therefore inexpensive.

While there is shown and described present preferred embodiments of theinvention, it is to be distinctly understood that the invention is notlimited thereto,.but may be otherwise variously embodied and practicedwithin the scope of the following claims. Accordingly,

What is claimed is:

- l. A chuck device for a tube serving as a bobbin support, comprising achuck sleeve, a thread catch ring and a thread servering ring definingtherebetween a thread catch zone mounted on said chuck sleeve, saidthread severing ring having an end face provided with a substantiallyring-shaped arrangement of spaced teeth and intermediate recesses, eachof said teeth having an inner sharp cutting edge for engaging andcutting a thread, said teeth being arranged in a direction which facesaway from the end of the tube when mounted on the chuck sleeve, saidthread catch ring being arranged at the region, of said end face of thethread severing ring, said thread catch ring having a thread guidesurface extending partially beneath the teeth when the tube iscompletely pushed onto the chuck sleeve, and

thread clamp means for the thread.

2. The chuck device as defined in claim 1, wherein each of the teethpossess a conical outer surface inclined in the direction of the tube.

3. The chuck device as defined in claim 1, wherein each of the teethpossess a conical inner surface and said inner cutting edge is inclined.

4. The chuck device as defined in claim 3, wherein.

the conical inner surface tapers at an inclination away from the tube.

5. The chuck device as defined in claim 1, wherein the thread severingring is mounted on the chuck sleeve so as to be movable therealong.

6. The chuck device as defined in claim 1, further including means forfixedly mounting the thread catch ring on the chuck sleeve.

7. The chuck device as defined in claim 1, wherein the thread catch ringpossesses a conical thread guide surface defining said thread guidesurface extending partially beneath the teeth.

8. The chuck device as defined in claim 1, wherein the thread catch ringpossesses a cylindrical thread guide surface.

9. The chuck device as defined in claim 1, wherein the thread catch ringpossesses a cylindrical thread guide surface and a conical thread guidesurface extending in the direction towards the tube, at least one ofsaid guide surfaces defining said thread guide surface extendingpartially beneath the teeth.

10. The chuck device as defined in claim 1, wherein the thread clampingmeans are defined by a gap formed between the thread catch ring and thethread severing ring.

1 l. The chuck device as defined in claim 10, wherein the gap is limitedby essentially parallel walls.

1 2. The chuck device as defined in claim 10, wherein the gap is limitedby conical boundary walls.

13. The chuck device as defined in claim 1, wherein the thread severingring includes means for guiding and receiving the tube.

14. The chuck device as defined in claim 13, further including a stop,said thread severing ring being displaceably mounted on the chuck sleevebetween the thread catch ring and the stop.

15. The chuck device as defined in claim 13, further including means forconnecting the thread severing ring with the tube so that the threadsevering ring can be withdrawn together with the tube from the chucksleeve.

1. A chuck device for a tube serving as a bobbin support, comprising achuck sleeve, a thread catch ring and a thread servering ring definingtherebetween a thread catch zone mounted on said chuck sleeve, saidthread severing ring having an end face provided with a substantiallyring-shaped arrangement of spaced teeth and intermediate recesses, eachof said teeth having an inner sharp cutting edge for engaging andcutting a thread, said teeth being arranged in a direction which facesaway from the end of the tube when mounted on the chuck sleeve, saidthread catch ring being arranged at the region of said end face of thethread severing ring, said thread catch ring having a thread guidesurface extending partially beneath the teeth when the tube iscompletely pushed onto the chuck sleeve, and thread clamp means for thethread.
 2. The chuck device as defined in claim 1, wherein each of theteeth possess a conical outer surface inclined in the direction of thetube.
 3. The chuck device as defined in claim 1, wherein each of theteeth possess a conical inner surface and said inner cutting edge isinclined.
 4. The chuck device as defined in claim 3, wherein the conicalinner surface tapers at an inclination away from the tube.
 5. The chuckdevice as defined in claim 1, wherein the thread severing ring ismounted on the chuck sleeve so as to be movable therealong.
 6. The chuckdevice as defined in claim 1, further including means for fixedlymounting the thread catch ring on the chuck sleeve.
 7. The chuck deviceas defined in claim 1, wherein the thread catch ring possesses a conicalthread guide surface defining said thread guide surface extendingpartially beneath the teeth.
 8. The chuck device as defined in claim 1,wherein the thread catch ring possesses a cylindrical thread guidesurface.
 9. The chuck device as defined in claim 1, wherein the threadcatch ring possesses a cylindrical thread guide surface and a conicalthread guide surface extending in the direction towards the tube, atleast one of said guide surfaces defining said thread guide surfaceextending partially beneath the teeth.
 10. The chuck device as definedin claim 1, wherein the thread clamping means are defined by a gapformed between the thread catch ring and the thread severing ring. 11.The chuck deviCe as defined in claim 10, wherein the gap is limited byessentially parallel walls.
 12. The chuck device as defined in claim 10,wherein the gap is limited by conical boundary walls.
 13. The chuckdevice as defined in claim 1, wherein the thread severing ring includesmeans for guiding and receiving the tube.
 14. The chuck device asdefined in claim 13, further including a stop, said thread severing ringbeing displaceably mounted on the chuck sleeve between the thread catchring and the stop.
 15. The chuck device as defined in claim 13, furtherincluding means for connecting the thread severing ring with the tube sothat the thread severing ring can be withdrawn together with the tubefrom the chuck sleeve.